Proposition 2.1 [1]}
Let \(K\)  be a nontrivial knot. Then
\(p(K)\ge {\left\lbrace \begin{array}{ll}\alpha (K) \qquad &{\text{if \ }} \alpha (K) {\text{ is odd}},\\\alpha (K)+1 \qquad &{\text{if \ }} \alpha (K) {\text{ is even}}.\end{array}\right.}\) 

